list_plant=["水星","金星","火星","木星"]
list_plant.insert(0,"地球")
print(list_plant)
list_append=["土星","天王星","海王星"]
for i in range(len(list_append)):
    list_plant.append(list_append[i])
print(list_plant)
print(list_plant[0])
print(list_plant[-1])
print(list_plant[:2])
for i in range(len(list_plant)-1,-1,-1):
    print(list_plant[i])